Ha...
I've done it b-4, on my Intl. COE. You roll to the T/A when a dually goes out, or you take off an outside dually to trade out a blown steer. However, that little 12V air compressor for the seats and exhaust brake won't drive a 3/4" or 1" impact wrench. So its call 4 help (Cell, CB, or left thumb) with this one, but the Verizon net is real good in these parts, so its not been a problem.
To be serious about your dilema, I'd get an extend plate mounted on center to the back of your headache rail with mounting bolts for the tire. Sounds like you could fabricate that yourself on the ranch, and you can paint it to match so it looks OEM.
Good Luck.
RF